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Astron. Astrophys. 356, 747-756 (2000)
Acknowledgements
The authors are very grateful for the comments of M. Fulle. DJS acknowledges support from NASA's Planetary Geology and Geophysics Program and by the TMOD Technology Program by a grant from the Jet Propulsion Laboratory, California Institute of Technology which is under contract with the National Aeronautics and Space Administration.
© European Southern Observatory (ESO) 2000
Online publication: April 10, 2000
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